It's kind of unusual to see the developers of a rooting or hacking program willingly take down their own program for the greater good, but that seems to be exaclt ywhat the folks behind ChevronWP7 have done.
The developers have apparently have talked to Brandon Watson, Microsoft's Director of Developer Experience for Windows Phone 7. Chevron's guys were apparently impressed enough with the possibility of the Windows Phone 7 team supporting homebrew development that they pulled their own program as a good faith effort. It may all be for naught, but the possibility does loom out there for Windows Phone 7 to be a more user-tweakable OS.
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